Synthesis and electrochemical performance study of LiNi_1/3Co_1/3Mn_1/3O₂ cathode material

Layer-structured LiNi_1/3Co_1/3Mn_1/3O₂ cathode material was prepared by self-propagating solid-state metathesis-rheological phase method. LiNi_1/3Co_1/3Mn_1/3O₂ materials prepared at different sintering temperatures were studied by SEM, XRD and electrochemical test. The result indicates the sample sintered at 850°C, 20h has the best two-dimensional layered structure and cationic degree of order. The particle size is 250 nm and its distribution is uniform. The initial specific discharge capacity of 169 mAh/g is obtained between 2.8-4.3 V, at 80 mAh/g, and discharge capacity retention rate is 82.6% after 30 cycles. Increasing charge cut-off voltage could improve the previous discharge capacities. The discharge capacity cycled at 32 mAh/g is 174 mAh/g after 10 cycles in the voltage range of 2.8-4.4 V, but after that, the capacities decay quickly and capacity retention becomes poor.